Altay
Member
Hello everyone, last year we launched a rocket aiming for 1.5km apogee. But while rocket was ascending wrong gyro readings from MPU6050 caused an early ejection and because of that we missed 1.5km apogee and landed with 900m apogee. Our algorithm was triggering ejection if pitch value after launch changes by 70 degrees.
This is the gyro outputs of MPU6050 during the flight:
Red line shows when ejection happened (around T + 8 sec). The reason it didn't trigger ejection right away was because of a safety condition in our algorithm.
As shown in the graph, data we got from MPU6050 gave us very faulty data and we're not really sure why that happened. Our best guess is combination of not using a proper filter and vibrations in the rocket. If you have a idea can you please share with us?
Also we're designing a new flight computer which will also feature an IMU but this time we're not going to try to detect apogee by tilt detection, we will try to measure speed of the rocket and detect the apogee when speed gets close to zero. And we think cheap IMUs like MPU6050 or MPU9250 can't be used in this kind of applications. We're thinking about few options like BNO055 but we're not sure which IMU can handle rocket dynamics. Can you suggest us a IMU or can you share with us what should we watch out while selecting an IMU for our new design?
Thank you for reading.
This is the gyro outputs of MPU6050 during the flight:
Red line shows when ejection happened (around T + 8 sec). The reason it didn't trigger ejection right away was because of a safety condition in our algorithm.
As shown in the graph, data we got from MPU6050 gave us very faulty data and we're not really sure why that happened. Our best guess is combination of not using a proper filter and vibrations in the rocket. If you have a idea can you please share with us?
Also we're designing a new flight computer which will also feature an IMU but this time we're not going to try to detect apogee by tilt detection, we will try to measure speed of the rocket and detect the apogee when speed gets close to zero. And we think cheap IMUs like MPU6050 or MPU9250 can't be used in this kind of applications. We're thinking about few options like BNO055 but we're not sure which IMU can handle rocket dynamics. Can you suggest us a IMU or can you share with us what should we watch out while selecting an IMU for our new design?
Thank you for reading.